/*
 * Copyright (c) Thorben Linneweber and others
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

using System.Collections.Generic;
using Jitter2.Dynamics;
using Jitter2.Dynamics.Constraints;

using SoftFloat;

namespace Jitter2.SoftBodies
{
	
	public class SoftBody
	{
	    public List<RigidBody> Vertices { get; } = new();
	    public List<Constraint> Springs { get; } = new();
	    public List<SoftBodyShape> Shapes { get; } = new();
	
	    protected World world;
	
	    public bool IsActive => Vertices[0].IsActive;
	
	    public SoftBody(World world)
	    {
	        this.world = world;
	        world.PostStep += WorldOnPostStep;
	    }
	
	    public void Destroy()
	    {
	        world.PostStep -= WorldOnPostStep;
	
	        foreach (var shape in Shapes)
	        {
	            world.DynamicTree.RemoveProxy(shape);
	        }
	
	        foreach (var spring in Springs)
	        {
	            world.Remove(spring);
	        }
	
	        foreach (var point in Vertices)
	        {
	            world.Remove(point);
	        }
	    }
	
	    private bool active = true;
	
	    protected virtual void WorldOnPostStep(sfloat dt)
	    {
	        if (IsActive == active) return;
	        active = IsActive;
	
	        foreach (var shape in Shapes)
	        {
	            if (active)
	            {
	                world.DynamicTree.Activate(shape);
	            }
	            else
	            {
	                world.DynamicTree.Deactivate(shape);
	            }
	        }
	    }
	}
}
